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Charge Pump & Step Up DC DC Converter Solutions for Powering White LEDs in
Series or Parallel Connections - Maxim Application Note #1037
(app note added 5/08) |
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Circuit delivers dimming control for white LED driver -
28-Oct-04 Issue of EDN The demand for power in color cell-phone
handsets is constantly increasing. New applications steadily emerge,
making it imperative to reduce power consumption in the design.
Examination of usage data shows .... [Design Idea by Wallace Ly, National
Semiconductor, Santa Clara, CA] |
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Circuit Drives Latching Relays - 02/01/96 EDN-Design
Ideas.....Figure 1 shows a low-parts-count circuit that can drive one- or
two-coil latching relays. Latching relays are useful in sensitive analog
designs. The 74ACT174 hex flip-flop has ample.... [Design Idea by Roy
McCammon, 3M Austin, TX] |
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Circuit drives mixed types and quantities of LEDs - 3-Oct-02
Issue of EDN Portable systems often use LEDs of different colors and
in varying quantities of each color. Some examples are white for the
display backlight, green for keypad .... [Design Idea by Mark Pearson,
Maxim Integrated Products, Sunnyvale, CA] |
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Circuit Drives White LEDs - 11/23/00 EDN-Design Ideas.....Newly available
white LEDs are replacing CCFLs (cold-cathode fluorescent lamps] in handheld
applications using a back-lit LCD. These applications include PDAs (personal digital
assistants], digital cameras, and cellular telephones, to name a few. Advantages of
white LEDs over CCFLs include longer life, higher efficiency, and significantly lower
operating voltages..... [Design Idea by Eddy Wells, Texas Instruments] |
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Compact Inductorless Boost Circuit Regulates White LED Bias Current - Maxim
Application Note #1116 (app note added 5/08) |
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Constant current, constant voltage converter drives white LEDs - 2-Sep-04
Issue of EDN LEDs usually take their drive from a constant dc-current source to
maintain constant luminescence. Most dc/dc converters, however, deliver a constant
voltage by comparing a feedback voltage to an internal reference via an internal error
amplifier. The easiest way to turn a simple dc/dc converter into a constant-current
source is to use a sense resistor to convert the output current to a voltage.....
[Design Idea by Keith Szolusha, Linear Technology Corp, Milpitas, CA] |
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DC/DC Converter Drives LumiLEDs White LEDs from a Variety of Power Sources -
DN340 Design Notes (Linear Technology) (app note added 6/06) |
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Drive High Intensity White LEDs Efficiently using the PIC16C781 - Microchip
Application Note Published 17-Jul-02.....[App Note] |
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Driving White LEDs - The 555 is capable of sinking and sourcing up to 200mA,
but it gets very hot when doing this on a 12v supply. The following circuit
shows the maximum number of white LEDs that can be realistically driven from a 555 and
we have limited the total current to about 130mA as each LED is designed to pass about
17mA to 22mA maximum. A white LED drops a characteristic 3.2v to 3.6v and this means
only 3 LEDs can be placed in series. |
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Dual Full Function White LED Step-Up Converter with Built-In Schottky Diodes -
Linear Technology LT3466.....[App Note] |
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Dual White LED Driver Features Integrated Switches & Schottky Diodes in 3mm × 3mm Dfn
Package - DN1010 Design Notes (Linear Technology) (app note
added 1/06) |
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Economical Circuit Drives White LEDs - 11/23/00 EDN-Design Ideas.....Newly
available white LEDs are replacing CCFLs (cold-cathode fluorescent lamps] in handheld
applications using a back-lit LCD. These applications include PDAs (personal digital
assistants], digital cameras, and cellular telephones, to name a few. Advantages of
white LEDs over CCFLs include longer life, higher efficiency, and significantly lower
operating voltages..... [Design Idea by Eddy Wells, Texas Instruments] |
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Efficiently Powering Nine White LEDs with the MCP1650 - Microchip
Application Note Published 3-Aug-04 (app note added 2/06) |
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Flying inductor LED series voltage boost circuit - A circuit that goes in
series with a white LED and a 1.5 volt cell to make > 3 Volts to drive a white
LED.....(schematic / circuit added 6/07) |
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High Efficiency 12V White LED Driver - 12 white LEDs [G. Forrest Cook] |
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High Efficiency ThinSOT White LED Driver Features Internal Switch & Schottky Diode
- DN325 Design Notes (Linear Technology) (app note added 1/06)
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High Efficiency White LED Driver Guarantees Matching LED Brightness - DN267
Design Notes (Linear Technology) (app note added 1/06) |
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High Efficienty ThinSOT White LED Driver Feature Switche & Schottky Diode -
Linear Technology Magazine Design Ideas May 2004.....[App Note] |
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High Efficienty White LED Driver Guarantees Matching LED Brightness - Linear
Technology Design Note 267.....[App Note] |
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Inductive Based Switching Regulator Circuits Provide High Efficiency White LED Driver
- National Semiconductor Application Note 1250 September 2002 (app note added
2/05) |
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